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VPC Peering scenario


Requirement:

Create 3 EC2 instances (Machine A, Machine B and Machine C)in 3 different VPCs(VPC A, VPC B, VPC C). We should be able to do SSH from Machine A to Machine B and from Machine B to Machine C.
However, we should NOT be allowed to Machine B to Machine A as well as Machine C to Machine B

Solution:

1.       Create two VPC with CIDR Range 10.0.1.0/24, 10.0.2.0/24 & 10.0.3.0/24
2.       Create Subnet in respective VPC with range same as VPC CIDR
3.       Create two Internet Gateway and attach to respective VPC.
4.       In default Route Table add the default Rule (0.0.0.0/0) and target to Internet Gateway.
5.       Create Peering connections (for VPC Peering)
a.       Select the Source as VPC A and destination as VPC B
b.       Accept the Peering request
c.       Select the Source as VPC B and destination as VPC C
d.       Accept the Peering request
6.       Edit Route table A and add the route to VPC B CIDR Range and target to VPC Peering
7.       Edit Route table B and add the route to VPC A CIDR Range and target to VPC Peering
8.       Edit Route table B and add the route to VPC C CIDR Range and target to VPC Peering
9.       Edit Route table C and add the route to VPC B CIDR Range and target to VPC Peering
10.   Create three EC2 instances (VM) in the respective VPC.
11.   Edit the default NACL of VPC A
·       Edit the inbound rule to deny login from VPC B CIDR range
12.       Edit the default NACL of VPC B
·        Edit the Inbound rule to deny from VPC C CIDR Range
 
13.       Login to Machine A and check if you should be able to ssh to Machine B. And Machine B to machine C.
a.       Machine A to Machine B (Successful SSH)
b.       Machine B to Machine C (Successful SSH)
14.       SSH should not be possible from Machine B to Machine A and Machine C to machine B
a.       Machine B to Machine A (Unsuccessful SSH)
 
b.       Machine C to Machine B (Unsuccessful SSH) 
       
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